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Conveying


Fly ash conveyor Dense phase pneumatic conveying of fly ash and quick lime


Metropolitan Council Environmental Solutions (MCES) is the regional authority that processes sanitary sewer waste for the Minneapolis-St. Paul metropolitan area. The MCES Metro Wastewater Facility in St. Paul is the largest of several MCES waste processing plants. The facility must operate 24 hours per day, 365 days per year. At the MCES Metro Wastewater Facility, sewage sludge is dried and then disposed of by incineration, which has the added benefit of generating power. The fly ash that is created from the incineration process is collected and put into storage silos. The fly ash is then either used for land fill or for secondary purposes such as an additive in concrete.


MCES has been incinerating sewage sludge for many years. Recently, their incinerators at the Metro facility were under threat of citation by the State of Minnesota for emissions violations. To avoid a citation and significant fines, the facility was required to build an entirely new incineration facility and completely abandon the old incinerators.


The new facility was designed to be located adjacent to the existing facility. Rather than build expensive new storage silos for the fly ash, MCES sought ways to convey the fly ash from the new facility back to their existing multi-compartment cast-in- place fly ash storage silos about 2200 feet away. MCES, after careful consideration, decided to proceed with dense phase pneumatic conveying systems for this application. One huge advantage of using the dense phase pneumatic conveying systems was that they could take advantage of an existing system of underground tunnels for the conveyor lines that would have to run between the existing facility and the planned new incineration facility.


Utilising the existing tunnels would make maintenance of the pneumatic conveying system much easier in the cold Minnesota weather, and it would be less expensive to install than an above ground approach.


Dynamic Air worked with MCES and their consultants to specify HDP 4000 Full Line Concept dense phase pneumatic


16 Solids & Bulk Handling • October 2011


www.solidsandbulk.co.uk


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